球墨铸铁表面激光熔覆TiC/钴基合金组织和性能研究

doi:10.11900/0412.1961.2016.00288

金属学报

2017, Vol. 53

Issue (4): 472-478 DOI: 10.11900/0412.1961.2016.00288

本期目录 | 过刊浏览

球墨铸铁表面激光熔覆TiC/钴基合金组织和性能研究

童文辉¹,赵子龙¹,张新元¹,王杰¹,国旭明¹,段新华²,刘豫²

1 沈阳航空航天大学材料科学与工程学院沈阳110136
2 沈阳大陆激光成套设备有限公司沈阳110136

Microstructure and Properties of TiC/Co-Based Alloyby Laser Cladding on the Surface of NodularGraphite Cast Iron

Wenhui TONG¹,Zilong ZHAO¹,Xinyuan ZHANG¹,Jie WANG¹,Xuming GUO¹,Xinhua DUAN²,Yu LIU²

1 School of Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China
2 Shenyang Dalu Laser Complete Equipment Co. Ltd., Shenyang 110136, China

引用本文:

童文辉,赵子龙,张新元,王杰,国旭明,段新华,刘豫. 球墨铸铁表面激光熔覆TiC/钴基合金组织和性能研究[J]. 金属学报, 2017, 53(4): 472-478.
Wenhui TONG, Zilong ZHAO, Xinyuan ZHANG, Jie WANG, Xuming GUO, Xinhua DUAN, Yu LIU. Microstructure and Properties of TiC/Co-Based Alloyby Laser Cladding on the Surface of NodularGraphite Cast Iron[J]. Acta Metall Sin, 2017, 53(4): 472-478.

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摘要:

采用激光熔覆方法在球墨铸铁表面制备30%TiC/钴基合金熔覆层,通过OM、SEM、EDS、XRD、TEM、MHV2000数显显微硬度计,分析了熔覆层的显微组织、成分、物相、熔覆层的硬度变化规律。结果表明,球墨铸铁基体与熔覆层能形成良好的冶金结合,熔覆层由表层的树枝晶和内部的胞状晶组成,从熔体中原位析出初晶TiC,且初晶TiC的量从熔覆层内部到表层逐渐增加,而未熔的TiC颗粒在晶间均匀分布,熔覆层主要由γ-Co、TiC、CoC_x和少量的Cr₇C₃相组成,熔覆层的最高硬度是1278.8 HV_0.2,提高到球墨铸铁基体的5倍以上。

关键词 ：激光熔覆, 钴基合金, TiC, 微观组织, 硬度

Abstract：

Ductile cast iron, with excellent comprehensive mechanical properties, is widely used manufacturing traction wheel, crankshaft, cylinder liner, etc.. However, in the harsh environment, it often leads to failure due to the serious surface wear. At present, the repair methods for the damaged parts are mainly thermal spraying, deposit welding and other methods, but the properties and application effect of the repaired parts need to be improved. In order to significantly improve the surface properties of ductile cast iron, the 30%TiC/Co-based alloy cladding layer prepared by laser cladding is put forward on the surface of ductile cast iron in this work. The microstructure, composition, phase, hardness of the laser cladding layer are investigated and analyzed by OM, SEM, EDS, XRD, TEM and MHV2000 digital microhardness tester. The results show that the cladding layer can be integrated metallurgically with the nodular graphite cast iron matrix. The cladding layer consists of a surface layer of dendritic crystals and an internal cellular crystal. The primary phase of TiC from the melt is precipitated in situ during the solidification after laser heating. The amount of the primary TiC is gradually increased from the inner layer to the surface layer. Meanwhile, the undissolved TiC is dispersively distributed among the dendrites. The laser cladding layer is mainly composed of γ-Co, TiC, CoC_x and a small amount of Cr₇C₃. The hardness maximum of the cladding layer is 1278.8 HV_0.2, up to 5 times more than the hardness of the nodular graphite cast iron matrix.

Key words： laser cladding Co-based alloy TiC microstructure hardness

收稿日期: 2016-07-07

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https://www.ams.org.cn/CN/10.11900/0412.1961.2016.00288 或 https://www.ams.org.cn/CN/Y2017/V53/I4/472

图1 激光熔覆层横截面的宏观形貌和微观组织

图2 球墨铸铁表面30%TiC/钴基合金激光熔覆层横截面组织形貌

图3 熔覆层横截面线扫描方向和元素分布

图4 激光熔覆层横截面SEM像和EDS结果

图5 30%TiC/钴基合金熔覆层的XRD谱

图6 30%TiC/钴基合金熔覆层中增强相的TEM像及SAED谱

图7 熔覆层横截面显微硬度分布

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